It turns out former Giant Tiki Barber is responsible...and there were other Giants in attendance.

TMZ spoke to Amukamara, who said he was joined by fullback Henry Hynoski, cornerback Walter Thurman, as well as ex-Giants including running backs Ahmad Bradshaw, Ottis Anderson and wideout Stephen Baker. The site noted Barber runs a site called Thuzio, where anyone can hire current and former athletes to make appearances for a price (Amukamara is listed at $6,250, for example, but lunch or dinner with him will cost just $3,750).

"It really was a big surprise for the boy A.J.," Amukamara told TMZ. "They announced us... they had our pictures, it was pretty great. I'm sure the kids had a great time, and so did I!!"

The cornerback also left Giants fans with an image of Hynoski to last through OTAs: "He was dancing before I got there. We did all do the 'Cha Cha Slide' together."